This is a pistol that belongs to my inlaws. It was (or so I am told) brought back by my wife's grandfather from WWII, whuch would seem to make sense given the "Made in Spain" markings and the stamp of what appears to be a bull on the barrel and the slide. He reportedly traded something to get it. The grips appear to have been replaced. The mechanism will dry fire, but I don't even know what caliber it is, guessing .22 or .25. Any info would be greatly appreciated.